OG12-124 problem some easy methods reqd

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OG12-124 problem some easy methods reqd

by kishokbabu » Mon Jan 02, 2012 3:55 am
--------------Favorable----Unfavorable---Not Sure
Candidate M-----40-----------20-----------40-----
Candidate N-----30-----------35-----------35-----


The table above shows the results of a survey of
100 voters who each responded "Favorable" or
"Unfavorable" or "Not Sure" when asked about their
impressions of Candidate M and of Candidate N. What
was the number of voters who responded "Favorable"
for both candidates?

(1) The number of voters who did not respond
"Favorable" for either candidate was 40.

(2) The number of voters who responded
"Unfavorable" for both candidates was 10.
Source: — Data Sufficiency |

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by LalaB » Mon Jan 02, 2012 8:31 am
M+N+Neither-Both=100

A is the answ, since

40+30+40-Both=100
Both=10

answ choice B gives us no info about voters who responded "Favorable" for both candidates

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